During experiments, tissues were maintained in Krebs’ solution consisting of (mM): NaCl 118.4, KCl 4.7, CaCl
2 2.5, MgSO
4 1.2, KH
2PO
4 1.2, NaHCO
3 25 and glucose 11.7.
ATP, tetraethylammonium chloride (TEA),
tetrodotoxin,
atropine sulfate monohydrate and
carbachol were obtained from FUJIFILM-Wako (Osaka, Japan).
D-tubocurarine,
suramin,
methoctramine hydrate,
4-diphenylacetoxy-N-methyl-piperidine methiodide (4-DAMP), pyridoxal phosphate-6-azophenyl-2,4-disulfonic acid
(PPADS),
cibacron blue F3GA (CBF3GA; synonym reactive blue 2) and
4-aminopyridine (4-AP) were obtained from Sigma-Aldrich (St Louis, MO, USA).
Glibenclamide and nicorandil were obtained from Tokyo Chemical Industry (Tokyo, Japan).
GSK1016790A was obtained from Cayman Chemical (Ann Arbor, MI, USA).
Apamin was obtained from Peptide Institute (Osaka, Japan).
tetrodotoxin was dissolved in citrate solution.
Glibenclamide, nicorandil and
GSK1016790A were dissolved in DMSO. Other drugs were dissolved in distilled water. The highest concentration of vehicles (0.1%) for the drugs alone had no effect on the basal tone and contractile responses at the concentrations used. The concentrations of drugs given were final concentrations in the bath solution.
Shiina T., Suzuki Y., Horii K., Sawamura T., Yuki N., Horii Y, & Shimizu Y. (2024). Purinergic inhibitory regulation of esophageal smooth muscle is mediated by P2Y receptors and ATP-dependent potassium channels in rats. The Journal of Physiological Sciences : JPS, 74, 26.